Rheumatoid arthritis MRI may not be able to see, MRI mainly observe soft tissue damage, can provide certain diagnostic clues for rheumatoid arthritis, if there is no soft tissue damage, the examination may not have positive findings. Rheumatoid arthritis is a reactive arthritic disease caused by Streptococcus haemolyticus infection. MRI mainly observes soft tissue damage, which can provide certain clues for the diagnosis of the disease, and the final diagnosis of rheumatoid arthritis needs to be combined with the patient’s primary manifestations, secondary manifestations and whether there is evidence of antecedent streptococcal infection, and other factors for a comprehensive analysis. The primary manifestations of rheumatoid arthritis include polyarthritis, carditis, annular erythema, subcutaneous nodules, chorea, etc. Secondary manifestations include increased acute reactants, prolongation of the PR interval on ECG, and arthralgia, fever, and evidence of antecedent streptococcal infection includes a positive culture of the pharyngeal swabs and an elevated anti-“O” potency. Rheumatoid arthritis needs to be diagnosed by a professional physician, and it is recommended that patients go to the Department of Rheumatology and Immunology of regular hospitals for detailed consultation and actively cooperate with the treatment.